Origin and speciation of major and trace PM elements in the Barcelona subway system

Wear in train and rail components in the Barcelona subway system includes brake pads, catenary wires, wheels, railways, and motor brushes. These components were characterised to evaluate their contribution to ambient particulate matter (PM) levels in two platforms (conventional F-L3 and new S-L9). T...

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Detalles Bibliográficos
Autores: Font, Oriol, Moreno, Teresa, Querol, X., Martins, Vania, Sánchez-Rodas Navarro, Daniel Alejandro, Miguel, Eladio de, Capdevila, Marta
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universidad de Huelva (UHU)
Repositorio:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:inglés
OAI Identifier:oai:ariasmontano.uhu.es:10272/20899
Acceso en línea:http://hdl.handle.net/10272/20899
Access Level:acceso abierto
Palabra clave:PM
Subway
Wear
Brake pads
Trace elements
23 Química
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spelling Origin and speciation of major and trace PM elements in the Barcelona subway systemFont, OriolMoreno, TeresaQuerol, X.Martins, VaniaSánchez-Rodas Navarro, Daniel AlejandroMiguel, Eladio deCapdevila, MartaPMSubwayWearBrake padsTrace elements23 QuímicaWear in train and rail components in the Barcelona subway system includes brake pads, catenary wires, wheels, railways, and motor brushes. These components were characterised to evaluate their contribution to ambient particulate matter (PM) levels in two platforms (conventional F-L3 and new S-L9). The observed chemical compositions of these components were used to interpret the mineralogical, chemical, and leachability patterns of subway platform particulate matter (PM). The use of sulphides such as molybdenite (MoS2), pyrite (FeS2), stibnite Sb2S3) rich in toxic elements such as in Cu, Ni, As, Hg, Cd, and Pb and abrasives such barite (BaSO4) and zinzite (ZnO) in the brake pad composition, the composition of the catenary rich in Cu (98% metallic-Cu) with traces of Hg and that of the wheel/rail (98% metallic-Fe) with traces of As results in the production of fine PM particles of As, Hg, Cu, and Sb in ambient air PM in platform as a consequence of the abrasion/friction and sparking processes. The temperature reached in the aforementioned processes give rise to fine condensed and water-soluble As species (most likely As2O3 and As2O5). Moreover, the stibnite (Sb2S3) Hg-rich lateral brake pads used in L9 also contribute to fine and relatively soluble Sb and Hg oxides. Sulphide-rich brake pads significantly increase and change the occurrence mode of the Zn, Cu, Mn, Cr, Pb, and Ni present in PM by oxidation of brake-bearing metal sulphide to relatively water-soluble sulphate and oxide species. These changes in the mode of occurrence and speciation of elements in the PM of subway platforms points to the need for in-depth PM speciation studies, as well as the need for substituting conventional friction materials with low-metal materials—such as graphite pantographs/catenaries and rubber wheels and low toxic sulphides in brake pads—to reduce exposure to metals during subway commuting.Elsevier20192019-01-0120192019-01-01journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10272/20899reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelvainstname:Universidad de Huelva (UHU)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ariasmontano.uhu.es:10272/208992026-06-02T14:58:11Z
dc.title.none.fl_str_mv Origin and speciation of major and trace PM elements in the Barcelona subway system
title Origin and speciation of major and trace PM elements in the Barcelona subway system
spellingShingle Origin and speciation of major and trace PM elements in the Barcelona subway system
Font, Oriol
PM
Subway
Wear
Brake pads
Trace elements
23 Química
title_short Origin and speciation of major and trace PM elements in the Barcelona subway system
title_full Origin and speciation of major and trace PM elements in the Barcelona subway system
title_fullStr Origin and speciation of major and trace PM elements in the Barcelona subway system
title_full_unstemmed Origin and speciation of major and trace PM elements in the Barcelona subway system
title_sort Origin and speciation of major and trace PM elements in the Barcelona subway system
dc.creator.none.fl_str_mv Font, Oriol
Moreno, Teresa
Querol, X.
Martins, Vania
Sánchez-Rodas Navarro, Daniel Alejandro
Miguel, Eladio de
Capdevila, Marta
author Font, Oriol
author_facet Font, Oriol
Moreno, Teresa
Querol, X.
Martins, Vania
Sánchez-Rodas Navarro, Daniel Alejandro
Miguel, Eladio de
Capdevila, Marta
author_role author
author2 Moreno, Teresa
Querol, X.
Martins, Vania
Sánchez-Rodas Navarro, Daniel Alejandro
Miguel, Eladio de
Capdevila, Marta
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv PM
Subway
Wear
Brake pads
Trace elements
23 Química
topic PM
Subway
Wear
Brake pads
Trace elements
23 Química
description Wear in train and rail components in the Barcelona subway system includes brake pads, catenary wires, wheels, railways, and motor brushes. These components were characterised to evaluate their contribution to ambient particulate matter (PM) levels in two platforms (conventional F-L3 and new S-L9). The observed chemical compositions of these components were used to interpret the mineralogical, chemical, and leachability patterns of subway platform particulate matter (PM). The use of sulphides such as molybdenite (MoS2), pyrite (FeS2), stibnite Sb2S3) rich in toxic elements such as in Cu, Ni, As, Hg, Cd, and Pb and abrasives such barite (BaSO4) and zinzite (ZnO) in the brake pad composition, the composition of the catenary rich in Cu (98% metallic-Cu) with traces of Hg and that of the wheel/rail (98% metallic-Fe) with traces of As results in the production of fine PM particles of As, Hg, Cu, and Sb in ambient air PM in platform as a consequence of the abrasion/friction and sparking processes. The temperature reached in the aforementioned processes give rise to fine condensed and water-soluble As species (most likely As2O3 and As2O5). Moreover, the stibnite (Sb2S3) Hg-rich lateral brake pads used in L9 also contribute to fine and relatively soluble Sb and Hg oxides. Sulphide-rich brake pads significantly increase and change the occurrence mode of the Zn, Cu, Mn, Cr, Pb, and Ni present in PM by oxidation of brake-bearing metal sulphide to relatively water-soluble sulphate and oxide species. These changes in the mode of occurrence and speciation of elements in the PM of subway platforms points to the need for in-depth PM speciation studies, as well as the need for substituting conventional friction materials with low-metal materials—such as graphite pantographs/catenaries and rubber wheels and low toxic sulphides in brake pads—to reduce exposure to metals during subway commuting.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-01-01
2019
2019-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10272/20899
url http://hdl.handle.net/10272/20899
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelva
instname:Universidad de Huelva (UHU)
instname_str Universidad de Huelva (UHU)
reponame_str Arias Montano. Repositorio Institucional de la Universidad de Huelva
collection Arias Montano. Repositorio Institucional de la Universidad de Huelva
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812455

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